Process of recovering alkalis from silicate rocks.



ATEES ramnur UFFIOE.

$0MA GELLERI, 0F BUDAPEST, AUSTRIA-HUNGARY, ASSIGNOR 0F ONE-BAKE TU ANTON HAMIBLOCH, 01E ARDEN/NASH, GERMANY.

PROCESS OF RECOVERING ALKAYJIS FRUM SILIGA'IE ROCKS.

No Drawing".

T 0 aZZ whom it may concern:

Be it known that I, SOMA Giannini, a subject of the Kine" of Hungary, residing at Budapest, Austiia-l-lungary, have invented new and useful Improvements in Processes of Recovering Alkalis from Silicate Rocks, of Which the following is a specification.

A knovn process for recovering alkalis from silicaterocks consists in treating the silicates w :h vapor of ammonium carbonate under pressure, whereby the alkalis contained in the silicates are liberated in the form of carbonates. According to the present invention this method of recovering alkalis from silicate rocks by means of vapor of ammon um. carbonate may be so applied that the alkalis contained in the silicates are liberated in'the form of sulfates. For this purpose, before the treatment with vapor of ammonium carbonate the silicates are heated with limestone or an alkaline earth metal oxid and with a sulfate.

Preferably there is used for the purpose alunite.

is increased.

The whole reaction which constitutes the bas1s of the invention proceeds in accordance with the following equation:

2KA1Si 0 +6CuCO +KgSO .Ali(SO4la= Ortho- Lime- Mixed sulfates close. stone. of alunite.

Specification of Letters Patent.

Application filed January 3, 1912. ficrlal No. 69,2l'3.

Patented Nov. lit, 1 913..

operation passes into solution together with, the potassium sulfate. For thepurpose of avoiding this objection the silicates, preliminarily heated with lime-stone and a sulfate, are subjected to the action of vapor of ammonium carbonate under pressure which decomposes the calcium potassium silicate, whereby the potassium carbonate which is formed during" the opening up with the vapor of ammonium carbonate reacts with he excess of lime and sulfate, or it may he that the ammonium carbonate itself reacts in this manner. By this method the whole of the lime is separated in the form of asilicate or of an aluminatc and of a carbonate; so also the silica and alumina which are eventually liberated are separated so that pure potassium sulfate alone passes into-aw lution.

In the process conducted in this manner the whole of the ammonia of the ammonium carbonate is liberated; it is re-converted into ammonium carbonate for the purpose of opening up a fresh batch of silicates. The silicates freed from alltalis and preliminarily burnt with lime and a sulfate which now form a mixture free from sulfuric acid, are burnt by another healing operation to produce Portland cement.

Having thus described my invention and the best, means ll know of carrying the same into practical effect, 1' claim 1. A process of recovering alkalis from silicate rocks consisting in heating thesilicates with lime and a sulfate and in treating the heated mass with vapors of ammonium carbonate under high pressure.

2. A process for recovering alkalis from silicate rocks consisting; in heating the "sillcates with limestone and a sulfate and in, treating the heated mass with vapors of ammonium carbonate under high pressure.

in testimony. that I claim the foregoing as my invention, have signed my name in presence of two subscribing Witnesses.

SOMA GELLldl't-I. Witnesses E. H KnLnMnn, Pinon li'unnnnr. 

